OreCrafter

--Automatic crafting system. Used for crafting ore blocks.

local tableSlots = {1,2,3,5,6,7,9,10,11}
local a = 1

local function craft(slot)
    local b = turtle.getItemCount(slot)
    local reps = (b - math.fmod(b,9)) / 9    --Figure out amount of blocks to create
    if slot ~= 16 then    --Make sure the crafting materials are in slot 16
        turtle.select(16)
        turtle.dropDown()
        turtle.select(slot)
        turtle.transferTo(16)
    end
    for i = 1,16 do    --Set up the crafting grid
        turtle.select(i)
        turtle.dropDown()    --Clear the slots
        if i == tableSlots[a] then
            turtle.select(16)
            turtle.transferTo(tableSlots[a], reps)          --Transfer materials to the crafting slots
            a = a + 1
        end
    end
    turtle.select(1)
    a = 1
    if turtle.craft() then    --If it crafted, move to a chest in front
        turtle.drop()
    else                      --If not, empty grid
        for i = 1,9 do
            turtle.select(tableSlots[i])
            turtle.drop()
        end
    end
    for i = 1,16 do
        turtle.suckDown()
    end
end

while true do
    turtle.suckDown()
    for j = 1,16 do
        if turtle.getItemCount(j) >= 9 then
            craft(j)
            break
        end
    end
    sleep(5)
end